The Size 14 double stack by Haydon Kerk Motion Solutions is a 35mm stepper motor linear actuator. Size 14, 35000 double stack series linear actuators are available in three designs - captive, non-captive and external linear versions. Available in a variety of resolutions, ranging from 0.0158mm to 0.127mm per step. The size 14 double stack series stepper motor linear actuator delivers force of up to 50 lbs (220N). Typical applications include medical equipment, semiconductor handling, valve control, X-Y tables, hand held instruments, or wherever precise linear motion is required.